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12 cells of each e.m.f 2V are connected in series, among them if 3 cells are connected wrongly. Then the effective e.m.f. of the combination is

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18 V

12 V

24 V

6 V

answer is B.

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Detailed Solution

$\in^{'} = (N - 2 m) \in = (12 - 2 \times 3) 2 = 12 V$

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